ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.8 > M85.87 M85.87 Other specified disorders of bone density and structure, ankle and foot Non-Billable/Non-Specific Codes M85.871Other specified disorders of bone density and structure, right ankle and footM85.872Other specified disorders of bone density and structure, left ankle and footM85.879Other specified disorders of bone density and structure, unspecified ankle and foot